The wine aluminum screw cap (also known as a screw cap or Stelvin cap) is a bottle closure made primarily of aluminum alloy. It seals the bottle by tightly engaging with the bottle’s threaded neck through an internal liner. Originally designed to address issues associated with traditional corks—such as contamination and oxidation—it also significantly improves opening convenience.
Screw caps offer excellent sealing performance, effectively isolating the wine from air and microorganisms, thus preventing oxidation and spoilage. HAOMEI Aluminum supports full customization, including foil stamping, logo engraving, and is compatible with a variety of bottle types, including red wine, white wine, and enzyme beverage bottles.
Structure of the Screw Aluminum Cap
A standard wine aluminum cap typically consists of the following parts:
Cap Body
Made of food-grade aluminum alloys such as 8011-H14 or 3105-H16, offering excellent ductility, strength, and corrosion resistance.
Liner (Sealing Gasket)
An internal gasket made from PE, EPE, or Saranex material ensures tight sealing and effectively prevents oxygen ingress and liquid leakage.
Thread Design
The inner side wall features precision-formed threads that match the bottle neck, ensuring a secure fit. The design allows for multiple opens and resealing by the consumer.
Surface Printing and Coating
The outer surface is treated with anodizing, electrophoresis, baking paint, or silkscreen printing, allowing custom logos, patterns, colors, and branding information.
Product Specifications
| Item Name | ROPP Wine Bottle Cap |
| Material | Aluminum 8011 H14 / H16 |
| Colors | White, Black, Red, or Customized Colors |
| Sizes | 30x60mm, 30x44mm, 31.5x24mm, 28mm neck fit |
| MOQ | 10,000 pcs (check stock availability with customer service) |
| Application | Wine bottle closure |
| Usage | Glass bottle cap |
| Sample | Provided |
| OEM/ODM | Accepted |
| Packaging | Carton + Pallet |
Core Advantages of Wine Aluminum Screw Caps
1.Eliminates Cork Taint
This is the biggest advantage. Screw caps eliminate the risk of cork taint (TCA contamination), ensuring every bottle delivers the intended flavor profile.
2.Excellent Sealing
Screw caps provide a highly stable seal, keeping out oxygen and preserving the wine's freshness and fruitiness—especially ideal for young wines and white wines meant for early consumption.
3.Consistent Quality
Thanks to reliable sealing, screw caps ensure better batch consistency, reducing the risk of individual bottles going bad due to closure flaws.
4.Easy to Use
No corkscrew is needed—simply twist to open and reseal. This makes them convenient for outdoor use, picnics, and casual consumption.
5.Environmentally Friendly
Aluminum is a recyclable material. When made purely of aluminum, screw caps are highly recyclable. Even with liners, they remain more eco-friendly than cork.
6.Long-Term Aging Potential
While initially considered unsuitable for aging, modern screw caps with advanced liners now allow micro-oxygen transmission, making them suitable even for long-term cellaring of certain wines.
Comparison with Traditional Cork
| Feature | Screw Aluminum Cap | Natural Cork |
| Sealing Performance | Excellent, near-total oxygen barrier | Allows slight oxygen ingress, may dry or mold |
| Ease of Opening | Tool-free, resealable | Requires corkscrew, single-use only |
| Cost | Lower (mass-produced) | Higher (depends on natural cork sources) |
| Aging Suitability | Best for early-drinking, fruity wines | Suitable for long-aging, tannic wines |
| Sustainability | Up to 95% recyclable aluminum | Natural but resource-limited |
| Appearance | Customizable surface and branding | Traditional appearance only |
